Charles g



(No Model.)

U. G. BURKE.

TELEGRAPH INSTRUMENT.

No. 405,988. Patented June 25, 1889.

N I Q Q N J Q *1 is? l Snow V60; wax/M20009 flom/ @513- W aflomw-x /y CiUNITED STATES PATENT OFFICE.

CHARLES G. BURKE, OF RICHMOND HILL, ASSIGNOR TO FREDERICK IVOLFFE,

TRUSTEE, OF NEII YORK, N. Y.

TELEGRAPH-INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 405,988, dated June 25,1889.

Application filed January 18, 1889. Serial No. 296,717. (No model.)

To all whom it may concern:

Be it known that I, CHARLES G. BURKE, a citizen of the United States,residing at Richmond Hill, in the county of Queens and State of NewYork, have invented certain new and useful Improvements inTelegraph-Instruments, of which the following is a specification.

The obj ect of the invention is to provide a sensitive receivingtelegraphic instrument suitable for cables and other lines where feeblecurrents are used.

The invention will be readily understood by those skilled in the art byinspection of the accompanying drawings, in which Figure 1 is a plan ofan instrument partly in section, and Fig. 2 is a top view of a partthereof.

The moving part of the instrument consists of the bar F, pivoted at fand carrying four coils or solenoids B, two upon each side of the pivot.The main line L passes through these solenoids in series, as shown. Twomagnets A A are arranged, one above and one below the bar F, so thattheir pole-pieces a a enter within the solenoids, the magnets spanningthe point of support f and having their opposite poles on opposite sidesthereof. These magnets create magnetic fields of high intensity, andwhen a current passes through the main line L the bar F is moved in onedirection or the other, according to-the direction of the current. Itwill readily be seen that the poles of the magnets should be arranged insuch away as to act unitedly upon the solenoids. One end of the bar Fcarries the contact-points b, which play between the jaws of the arm Cwhich is frictionally attached to a standard at C Delicate springs s 8hold the bar steadily in equilibrium.

The local circuit can readily be traced from the battery through thelines Z and arm C a portion of the bar F, and sounder R.

The bracket-s D hold the magnets securely in place, and by means ofslots, as shown, in the brackets, and the set-screws T, which extendthrough into the magnets, the latter may be adjusted to the bestpositions.

I claim as my invention- 1. In a telegraphic instrument, two pairs ofcoils or solenoids connected in the line, said coils being affixed to apivoted bar, one pair upon each side of the pivot, and two magnetshaving their poles on each side of the pivot and extending within saidcoils, as described.

2. In a telegraphic instrument, two pairs of solenoids affixed to apivoted bar, one pair upon each side of the point of support, and twomagnets each spanning said pivot or point of support, with theirpole-pieces entering said solenoids.

3. The combination of the pivoted bar F, carrying the coils B, which arein the circuit of the main line, the magnets A A, each having one of itspoles entering a coil on one side of the point of support of said arm F,the arm 0 and contact-points b, which are in the local circuit.

4. In a telegraphic instrument, two pairs of solenoids affixed to apivoted bar, one pair upon each side of the point of support, twomagnets each spanning said pivot or point of support, with theirpole-pieces entering said solenoids, and means, substantially asdescribed, for adjusting the position of said magnets.

In testimony whereof I have hereunto subscribed my name this 16th day ofJanuary, A. D. 1889.

CHARLES G. BURKE.

VVitn esses:

DANL. W. EDGECOMB, CAROLINE E. DAVIDSON.

